Fan-out semiconductor package

ABSTRACT

A fan-out semiconductor package is provided. A semiconductor chip is disposed in a through hole of a first connection member. At least a portion of the semiconductor chip is encapsulated by an encapsulant. A second connection member including a redistribution layer is formed on an active surface of the semiconductor chip. An external connection terminal having excellent reliability is formed on the encapsulant.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a divisional patent application of U.S. patentapplication Ser. No. 15/441,655, filed on Feb. 24, 2017 which claims thebenefit of priority to Korean Patent Application No. 10-2016-0126233,filed on Sep. 30, 2016 with the Korean Intellectual Property Office, theentireties of which are incorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to a fan-out semiconductor package, inwhich a connection terminal may extend outwardly of a region in which asemiconductor chip is disposed.

BACKGROUND

Recently, a significant trend in the development of technology relatedto semiconductor chips is reducing the size of electronic components.Hence, in the field of packaging, in accordance with a rapid increase indemand for compact semiconductor chips, or the like, the implementationof an electronic component package having a compact size and including aplurality of pins has been demanded.

One package technology proposed to meet the demand for compactsemiconductor chips is fan-out semiconductor package technology. Fan-outsemiconductor package technology may allow connection terminals to beredistributed outwardly of a region in which semiconductor chips aredisposed, thereby having a compact size and allowing a plurality of pinsto be implemented.

SUMMARY

An aspect of the present disclosure may provide a fan-out semiconductorpackage, in which an external connection terminal formed in an upperportion thereof may have excellent reliability.

According to an aspect of the present disclosure, a fan-outsemiconductor package includes: a first connection member having athrough hole; a semiconductor chip disposed in the through hole, andhaving an active surface having a connection pad disposed thereon and aninactive surface opposing the active surface; an encapsulantencapsulating at least portions of the first connection member and theinactive surface of the semiconductor chip; a second connection memberdisposed on the first connection member and the active surface of thesemiconductor chip; an opening passing through the encapsulant; and anexternal connection terminal filling at least a portion of the opening.The first connection member and the second connection member includeredistribution layers electrically connected to the connection pad ofthe semiconductor chip, respectively. The redistribution layer of thefirst connection member includes a pad having at least a portion exposedby the opening to be connected to the external connection terminal. Awall surface of the opening has a surface roughness greater than asurface roughness of an exposed surface of the pad.

According to an aspect of the present disclosure, a fan-outsemiconductor package includes: a first connection member having athrough hole; a semiconductor chip disposed in the through hole, andhaving an active surface having a connection pad disposed thereon and aninactive surface opposing the active surface; an encapsulantencapsulating at least portions of the first connection member and theinactive surface of the semiconductor chip; a second connection memberdisposed on the first connection member and the active surface of thesemiconductor chip; a reinforcing layer disposed on the encapsulant, andhaving an opening; and an external connection terminal filling at leasta portion of the opening. The first connection member and the secondconnection member include redistribution layers electrically connectedto the connection pad of the semiconductor chip, respectively. A wallsurface of the opening includes a void filled with a portion of theexternal connection terminal.

BRIEF DESCRIPTION OF DRAWINGS

The above and other aspects, features, and advantages of the presentdisclosure will be more clearly understood from the following detaileddescription, taken in conjunction with the accompanying drawings, inwhich:

FIG. 1 is a schematic block diagram illustrating an example of anelectronic device system;

FIG. 2 is a schematic perspective view illustrating an example of anelectronic device;

FIG. 3A shows a schematic cross-sectional view and a schematic plan viewof a fan-in semiconductor package before and after packaging thereof;

FIG. 3B shows a schematic cross-sectional view and a schematic planviews of a fan-in semiconductor package before and after packagingthereof;

FIG. 4 is schematic cross-sectional views illustrating a process ofpackaging a fan-in semiconductor package;

FIG. 5 is a schematic cross-sectional view of a fan-in semiconductorpackage mounted on an interposer substrate and ultimately mounted on amain board of an electronic device;

FIG. 6 is a schematic cross-sectional view of a fan-in semiconductorpackage mounted within an interposer substrate and ultimately mounted ona main board of an electronic device;

FIG. 7 is a schematic cross-sectional view of a fan-out semiconductorpackage;

FIG. 8 is a schematic cross-sectional view of a fan-out semiconductorpackage mounted on a main board of an electronic device;

FIG. 9 is a schematic cross-sectional view illustrating an example of afan-out semiconductor package;

FIG. 10 is a schematic cut plan view taken along line I-I′ of FIG. 9;

FIG. 11 is a schematic cross-sectional view illustrating an example of afan-out semiconductor package;

FIG. 12 is a schematic cross-sectional view illustrating an example of afan-out semiconductor package;

FIG. 13 is a schematic cross-sectional view illustrating an example of afan-out semiconductor package;

FIG. 14 is a schematic cross-sectional view illustrating an example of afan-out semiconductor package; and

FIG. 15 is a schematic cross-sectional view illustrating an example of afan-out semiconductor package.

DETAILED DESCRIPTION

Hereinafter, embodiments of the present disclosure will be described asfollows with reference to the attached drawings.

The present disclosure may, however, be exemplified in many differentforms and should not be construed as being limited to the specificembodiments set forth herein. Rather, these embodiments are provided sothat this disclosure will be thorough and complete, and will fullyconvey the scope of the disclosure to those skilled in the art.

Throughout the specification, it will be understood that when anelement, such as a layer, region or wafer (substrate), is referred to asbeing “on,” “connected to,” or “coupled to” another element, it can bedirectly “on,” “connected to,” or “coupled to” the other element orother elements intervening therebetween may be present. In contrast,when an element is referred to as being “directly on,” “directlyconnected to,” or “directly coupled to” another element, there may be noother elements or layers intervening therebetween. Like numerals referto like elements throughout. As used herein, the term “and/or” includesany and all combinations of one or more of the associated listed items.

It will be apparent that though the terms first, second, third, etc. maybe used herein to describe various members, components, regions, layersand/or sections, these members, components, regions, layers and/orsections should not be limited by these terms. These terms are only usedto distinguish one member, component, region, layer or section fromanother region, layer or section. Thus, a first member, component,region, layer or section discussed below could be termed a secondmember, component, region, layer or section without departing from theteachings of the exemplary embodiments.

Spatially relative terms, such as “above,” “upper,” “below,” and “lower”and the like, may be used herein for ease of description to describe oneelement's relationship relative to another element(s) as shown in thefigures. It will be understood that the spatially relative terms areintended to encompass different orientations of the device in use oroperation in addition to the orientation depicted in the figures. Forexample, if the device in the figures is turned over, elements describedas “above,” or “upper” relative to other elements would then be oriented“below,” or “lower” relative to the other elements or features. Thus,the term “above” can encompass both the above and below orientationsdepending on a particular direction of the figures. The device may beotherwise oriented (rotated 90 degrees or at other orientations) and thespatially relative descriptors used herein may be interpretedaccordingly.

The terminology used herein describes particular embodiments only, andthe present disclosure is not limited thereby. As used herein, thesingular forms “a,” “an,” and “the” are intended to include the pluralforms as well, unless the context clearly indicates otherwise. It willbe further understood that the terms “comprises,” and/or “comprising”when used in this specification, specify the presence of statedfeatures, integers, steps, operations, members, elements, and/or groupsthereof, but do not preclude the presence or addition of one or moreother features, integers, steps, operations, members, elements, and/orgroups thereof.

Hereinafter, embodiments of the present disclosure will be describedwith reference to schematic views illustrating embodiments of thepresent disclosure. In the drawings, for example, due to manufacturingtechniques and/or tolerances, modifications of the shape shown may beestimated. Thus, embodiments of the present disclosure should not beconstrued as being limited to the particular shapes of regions shownherein, for example, to include a change in shape results inmanufacturing. The following embodiments may also be constituted aloneor as a combination thereof.

The contents of the present disclosure described below may have avariety of configurations and only a required configuration is proposedherein, but the present disclosure is not limited thereto.

Electronic Device

FIG. 1 is a schematic block diagram illustrating an example of anelectronic device system.

Referring to FIG. 1, an electronic device 1000 may receive a main board1010. The main board 1010 may include chip-related components 1020,network-related components 1030, other components 1040, or the like,physically or electrically connected to one another. These componentsmay be connected to other components to be described below to formvarious signal lines 1090.

The chip-related components 1020 may include a memory chip such as avolatile memory (for example, a dynamic random access memory (DRAM)), anon-volatile memory (for example, a read only memory (ROM)), a flashmemory, or the like; an application processor chip such as a centralprocessor (for example, a central processing unit (CPU)), a graphicprocessor (for example, a graphic processing unit (GPU)), a digitalsignal processor, a cryptographic processor, a microprocessor, amicrocontroller, or the like; and a logic chip such as ananalog-to-digital converter, an application-specific integrated circuit(ASIC), or the like. However, the chip-related components 1020 are notlimited thereto, but may also include other types of chip-relatedcomponents. In addition, the chip-related components 1020 may becombined with each other.

The network-related components 1030 may include protocols such aswireless fidelity (Wi-Fi) (institute of electrical and electronicsengineers (IEEE) 802.11 standard family, or the like), worldwideinteroperability for microwave access (WiMAX) (IEEE 802.16 standardfamily, or the like), IEEE 802.20, long term evolution (LTE), evolutiondata only (Ev-DO), high speed packet access+(HSPA+), high speed downlinkpacket access+(HSDPA+), high speed uplink packet access+(HSUPA+),enhanced data GSM environment (EDGE), global system for mobilecommunications (GSM), global positioning system (GPS), general packetradio service (GPRS), code division multiple access (CDMA), timedivision multiple access (TDMA), digital enhanced cordlesstelecommunications (DECT), Bluetooth, 3G, 4G, and 5G protocols, and anyother wireless and wired protocols designated after the above-mentionedprotocols. However, the network-related components 1030 are not limitedthereto, but may also include a variety of other wireless or wiredstandards or protocols. In addition, the network-related components 1030may be combined with each other, together with the chip-relatedcomponents 1020.

Other components 1040 may include a high frequency inductor, a ferriteinductor, a power inductor, ferrite beads, a low temperature co-firedceramic (LTCC), an electromagnetic interference (EMI) filter, amultilayer ceramic capacitor (MLCC), or the like. However, othercomponents 1040 are not limited thereto, but may also include passivecomponents used for various other purposes, or the like. In addition,other components 1040 may be combined with each other, together with thechip-related components 1020 or the network-related components 1030described above.

According to a type of the electronic device 1000, the electronic device1000 may include other components that may or may not be physically orelectrically connected to the main board 1010. These other componentsmay include, for example, a camera module 1050, an antenna 1060, adisplay device 1070, a battery 1080, an audio codec (not illustrated), avideo codec (not illustrated), a power amplifier (not illustrated), acompass (not illustrated), an accelerometer (not illustrated), agyroscope (not illustrated), a speaker (not illustrated), a mass storageunit (for example, a hard disk drive) (not illustrated), a compact disk(CD) drive (not illustrated), a digital versatile disk (DVD) drive (notillustrated), or the like. However, these other components are notlimited thereto, but may also include other components used for variouspurposes, according to a type of electronic device 1000, or the like.

The electronic device 1000 may be a smartphone, a personal digitalassistant (PDA), a digital video camera, a digital still camera, anetwork system, a computer, a monitor, a tablet personal computer (PC),a laptop PC, a netbook PC, a television, a video games machine, asmartwatch, or an automobile part. However, the electronic device 1000is not limited thereto, and may be any other electronic device able toprocess data.

FIG. 2 is a schematic perspective view illustrating an example of anelectronic device.

Referring to FIG. 2, a semiconductor package 100 may be applied tovarious types of electronic devices as described above for variouspurposes. For example, a main board 1110 may be accommodated in a bodyportion 1101 of a smartphone 1100, and various types of electroniccomponents 1120 may be physically or electrically connected to the mainboard 1110. In addition, other components that may or may not bephysically or electrically connected to the main board 1110, such as acamera module 1130 and the like, may be accommodated in the body portion1101. A portion of the electronic components 1120 may be chip-relatedcomponents as described above, and the semiconductor package 100 may be,for example, an application processor among the chip-related components,but is not limited thereto. An electronic device is not limited to thesmartphone 1100, and may be other electronic device as described above.

Semiconductor Package

In general, a semiconductor chip may have numerous electric circuitsintegrated therein. However, the semiconductor chip itself may notfunction as a finished semiconductor product, and may be likely to bedamaged by an external physical or chemical impact. Therefore, withoutbeing used as is, the semiconductor chip itself may be packaged, and maythen be used in an electronic device or the like in a packaged state.

Semiconductor packaging may be required because a circuit width of asemiconductor chip is different from that of a main board of theelectronic device, in terms of an electrical connection. In detail, inthe case of the semiconductor chip, a size of connection pads and aspacing therebetween may be microscopic, whereas in the case of the mainboard used in the electronic device, a size of electronic componentmounting pads and a spacing therebetween may be far greater than a scaleof the semiconductor chip. Thus, it may be difficult to directly mountthe semiconductor chip on such a main board, and thus, a packagingtechnology may be required to reduce the difference between the circuitwidths of the semiconductor chip and the main board of the electronicdevice.

A semiconductor package manufactured using such a packaging technologymay be divided into a fan-in semiconductor package and a fan-outsemiconductor package, according to a structure and purpose of thesemiconductor package.

Hereinafter, the fan-in semiconductor package and the fan-outsemiconductor package may be detailed with reference to the drawings.

Fan-in Semiconductor Package

FIG. 3A is schematic cross-sectional views and schematic plan views of afan-in semiconductor package before and after packaging thereof. FIG. 3Bis schematic cross-sectional views and schematic plan views of a fan-insemiconductor package before and after packaging thereof.

FIG. 4 is schematic cross-sectional views illustrating a process ofpackaging a fan-in semiconductor package.

Referring to the drawings, a semiconductor chip 2220 may be, forexample, an integrated circuit (IC) in a bare state. The IC may includea body portion 2221 including silicon (Si), germanium (Ge), or galliumarsenide (GaAs), a connection pad 2222 formed on one surface of the bodyportion 2221, and including a conductive material such as aluminum (Al),and a passivation film 2223 such as an oxide film or a nitride filmformed on one surface of the body portion 2221, and covering at least aportion of the connection pad 2222. Here, the connection pad 2222 may besignificantly small, and it may thus be difficult to mount the IC on aprinted circuit board (PCB) on an intermediate level, as well as on amain board or the like of an electronic device.

In order to redistribute the connection pad 2222, a connection member2240 may be formed on the semiconductor chip 2220, according to a sizeof the semiconductor chip 2220. The connection member 2240 may be formedby forming an insulating layer 2241 on the semiconductor chip 2220 usingan insulating material such as a photosensitive insulating resin (PID),forming a via hole 2243 h exposing the connection pad 2222 in theinsulating layer 2241, and forming a redistribution layer 2242 and a via2243. Then, a passivation layer 2250 protecting the connection member2240 may be formed, an opening 2251 may be formed, and an under-bumpmetal layer 2260 may be formed. Through a series of processes, forexample, a fan-in semiconductor package 2200 including the semiconductorchip 2220, the connection member 2240, the passivation layer 2250, andthe under-bump metal layer 2260 may be manufactured.

As described above, a fan-in semiconductor package may be manufacturedin package form in which a connection pad of a semiconductor chip, forexample, input/output (I/O) terminals are all disposed inside a device,may have good electrical characteristics, and may be produced at lowcost. Thus, many devices provided in a smartphone may be manufactured infan-in semiconductor package form, and in detail, may have beendeveloped in a manner in which the devices may quickly transmit signalswhile having a compact size.

Merely, the fan-in semiconductor package may be required to have all I/Oterminals disposed inside the semiconductor chip to thus have manyconstraints on space. Therefore, it may be difficult to apply such astructure to a semiconductor chip having a large number of I/O terminalsor a small-sized semiconductor chip. In addition, such a weak point maycause the fan-in semiconductor package not to be able to be directlymounted on the main board of the electronic device. Even when the I/Oterminals of the semiconductor chip are expanded in size and atintervals by a redistribution process, the fan-in semiconductor packagemay not have a size or an interval sufficient to be directly mounted onthe main board of the electronic device.

FIG. 5 is a schematic cross-sectional view of a fan-in semiconductorpackage mounted on an interposer substrate and ultimately mounted on amain board of an electronic device.

FIG. 6 is a schematic cross-sectional view of a fan-in semiconductorpackage mounted within an interposer substrate and ultimately mounted ona main board of an electronic device.

Referring to the drawings, in a fan-in semiconductor package 2200,connection pads 2222 of a semiconductor chip 2220, for example, I/Oterminals, may be redistributed by an interposer substrate 2301.Finally, the fan-in semiconductor package 2200 may be mounted on a mainboard 2500 of an electronic device while being mounted on the interposersubstrate 2301. Here, a solder ball 2270 or the like may be fixed by anunderfill resin 2280 or the like, and external surfaces of the underfillresin 2280 may be covered by a molding material 2290 or the like.Alternatively, the fan-in semiconductor package 2200 may be embeddedwithin a separate interposer substrate 2302, the connection pads 2222 ofa semiconductor chip 2220, for example, I/O terminals, may beredistributed by the interposer substrate 2302 while the fan-insemiconductor package 2200 is embedded within the interposer substrate2302, and the fan-in semiconductor package 2200 may be ultimatelymounted on the main board 2500 of the electronic device.

As described above, it may be difficult to directly mount a fan-insemiconductor package on a main board of an electronic device, and thus,the fan-in semiconductor package may be mounted on a separate interposersubstrate and then mounted on the main board of the electronic device bya packaging process, or may be mounted on a main board of an electronicdevice while being embedded within an interposer substrate.

Fan-Out Semiconductor Package

FIG. 7 is a schematic cross-sectional view of a fan-out semiconductorpackage.

Referring to the drawings, in a fan-out semiconductor package 2100, forexample, external surfaces of a semiconductor chip 2120 may be protectedby an encapsulant 2130, and a connection pad 2122 of the semiconductorchip 2120 may be redistributed outwardly of the semiconductor chip 2120by a connection member 2140. Here, a passivation layer 2150 may furtherbe formed on the connection member 2140, and an under-bump metal layer2160 may further be formed in an opening of the passivation layer 2150.A solder ball 2170 may further be formed on the under-bump metal layer2160. The semiconductor chip 2120 may be an IC, including a body portion2121, a connection pad 2122, and a passivation layer (not illustrated).The connection member 2140 may include an insulating layer 2141, aredistribution layer 2142 formed on the insulating layer 2141, and a via2143 electrically connecting the connection pad 2122 to theredistribution layer 2142.

A fan-out semiconductor package may have I/O terminals redistributedoutwardly of a semiconductor chip by a connection member formed on thesemiconductor chip. As described above, in the fan-in semiconductorpackage, all I/O terminals of the semiconductor chip may be required tobe disposed inside the semiconductor chip, and accordingly, when adevice size is decreased, a ball size or a ball pitch may be required tobe reduced. As a result, a standardized ball layout may not be used inthe fan-in semiconductor package. Conversely, the fan-out semiconductorpackage may have the I/O terminals redistributed outwardly of thesemiconductor chip by the connection member formed on the semiconductorchip as described above, and thus, even when a size of the semiconductorchip is decreased, a standardized ball layout may be used in the fan-outsemiconductor package as is. As a result, the fan-out semiconductorpackage may be mounted on a main board of an electronic device withoutusing a separate interposer.

FIG. 8 is a schematic cross-sectional view of a fan-out semiconductorpackage mounted on a main board of an electronic device.

Referring to the drawings, a fan-out semiconductor package 2100 may bemounted on a main board 2500 of an electronic device by a solder ball2170 or the like. For example, as described above, the fan-outsemiconductor package 2100 may have a connection member 2240 formed onthe semiconductor chip 2120 to redistribute a connection pad 2122 to afan-out region in a range outside of a size range of a semiconductorchip 2120, and thus, a standardized ball layout may be used in thefan-out semiconductor package 2100 as is. As a result, the fan-outsemiconductor package 2100 may be mounted on the main board 2500 of theelectronic device without using a separate interposer substrate.

The fan-out semiconductor package may be mounted on the main board ofthe electronic device without using a separate interposer substrate, andthus, a thickness of the fan-out semiconductor package may be reduced ascompared to that of the fan-in semiconductor package using a separateinterposer substrate. As a result, the fan-out semiconductor package maybe miniaturized and thinned. In addition, the fan-out semiconductorpackage may have excellent thermal and electrical characteristics tothus be particularly suitable for a mobile product. Furthermore, thefan-out semiconductor package may be implemented to be more compact thana common package on package (POP) type fan-out semiconductor packageusing a PCB, and may address issues due to a warpage phenomenon.

The fan-out semiconductor package may refer to a package technology formounting the semiconductor chip on the main board of the electronicdevice, or protecting the semiconductor chip from external impact, andmay be different from a PCB such as an interposer substrate having ascale and purpose different from those of the fan-out semiconductorpackage, and having a fan-in semiconductor package embedded therein.

Hereinafter, a fan-out semiconductor package having an externalconnection terminal formed on an upper portion thereof, and havingexcellent reliability will be described with reference to the drawings.

FIG. 9 is a schematic cross-sectional view illustrating an example of afan-out semiconductor package.

FIG. 10 is a schematic cut plan view taken along line I-I′ of thefan-out semiconductor package of FIG. 9.

Referring to the drawings, a fan-out semiconductor package 100Aaccording to an example may include a first connection member 110 havinga through hole 110H, a semiconductor chip 120 disposed in the throughhole 110H of the first connection member 110, and having an activesurface having a connection pad 122 disposed thereon, and an inactivesurface opposing the active surface, an encapsulant 130 encapsulating atleast portions of the first connection member 110 and the inactivesurface of the semiconductor chip 120, a second connection member 140disposed on the first connection member 110 and the active surface ofthe semiconductor chip 120, a reinforcing layer 181 disposed on theencapsulant 130, an opening 183 passing through the encapsulant 130 andthe reinforcing layer 181, and an external connection terminal 190filling at least a portion of the opening 183. First and secondredistribution layers 112 a and 112 b of the first connection member 110and a redistribution layer 142 of the second connection member 140 maybe electrically connected to the connection pad 122 of the semiconductorchip 120. The second redistribution layer 112 b of the first connectionmember 110 may have at least a portion exposed by the opening 183, andmay include a pad connected to the external connection terminal 190.Surface roughness of a wall surface of the opening 183 may be greaterthan that of an exposed surface of the pad connected to the externalconnection terminal 190.

Recently, a POP structure, in which the same type of packages ordifferent types of packages having a pattern structure that transmits asignal to a semiconductor package in a vertical manner in order toexpand memory capacity or improve operational performance of asemiconductor are vertically stacked, have been developed in variousways. For example, a POP structure may be formed by stacking aninterposer substrate, on which a memory chip is mounted, on asemiconductor package manufactured using a wafer as a basis, andelectrically connecting the interposer substrate to the semiconductorpackage using an external connection terminal such as a solder bump orthe like. However, an external connection terminal such as a solder bumpcommonly formed on an upper portion of a lower semiconductor package mayhave insufficient reliability in a harsh environment to cause componentyield to be reduced.

In contrast, in the fan-out semiconductor package 100A according to anexample, the surface roughness of the wall surface of the opening 183may be relatively greater than that of the exposed surface of the pad.Because the pad includes a metallic material, reliability at aninterface between the pad, and the external connection terminal 190including a metallic material may be unproblematic. Conversely, becausethe reinforcing layer 181 includes a resin material, reliability at aninterface between the reinforcing layer 181, and the external connectionterminal 190 including the metallic material may be problematic. Thus,it may be preferable that the surface roughness of the wall surface ofthe opening 183 is relatively greater than that of the exposed surfaceof the pad. In this case, connecting force between the wall surface ofthe opening 183 and the external connection terminal 190 may beincreased, resulting in an improvement in reliability at the interfacein a reliability test such as a TCoB test or a drop test. Surfaceroughness may be measured by a known method.

Meanwhile, in order to relatively increase the surface roughness of thewall surface of the opening 183, voids V1 a and V1 b may be formed inthe opening 183 passing through the reinforcing layer 181. In this case,the external connection terminal 190 such as a solder bump formed in theopening 183 may fill at least portions of the voids V1 a and V1 b duringa reflow process. The voids V1 a and V1 b, into which the externalconnection terminal 190 flows, may form an anchoring structure, andthus, reliability of the fan-out semiconductor package 100A may beincreased by preventing the external connection terminal 190 from beingseparated from the wall surface of the opening 183 even in a harshenvironment in which thermal or mechanical stress takes place. Forexample, the reliability at the interface may be increased in areliability test such as a TCoB test or a drop test.

Meanwhile, a material including an insulating resin 181 a, a core 181 b,and a filler 181 c may be used as the reinforcing layer 181. In thiscase, at least one of the voids V1 a and V1 b may be a recess formed inthe core 181 b by removing at least a portion of the core 181 b, andadditionally, at least the other of the voids V1 a and V1 b may be arecess formed in the insulating resin 181 a by removing at least aportion of the filler 181 c dispersed in the insulating resin 181 a. Thevoid V1 a, formed by removing the core 181 b, may allow for aparticularly excellent anchoring effect. In addition, the void V1 b,formed by removing the filler 181 c, may allow the anchoring effect tobe further increased. Here, the insulating resin 181 a may be athermosetting resin such as an epoxy resin, or a thermoplastic resinsuch as polyimide. The core 181 b may be glass fiber, glass cloth, orglass fabric. The filler 181 c may be an inorganic filler such as silicaor alumina.

If necessary, a resin layer 182 may be further disposed on thereinforcing layer 181. The resin layer 182 may be provided to facilitateeasier formation of the opening 183. In this respect, the opening 183may pass through the resin layer 182, and a void V2 having at least aportion filled with a portion of the external connection terminal 190may be present in wall surfaces of the resin layer 182 through which theopening 183 passes. Due to the presence of the void V2, the anchoringeffect may be further increased. The resin layer 182 may include aninsulating resin 182 a and a filler 182 b, and the void V2 may be arecess formed in the resin layer 182 by removing at least a portion ofthe filler 182 b dispersed in the resin layer 182. The insulating resin182 a may be a thermosetting resin such as an epoxy resin, or athermoplastic resin such as polyimide. The filler 182 b may be aninorganic filler such as silica or alumina.

If necessary, a void V3 having at least a portion filled with a portionof the external connection terminal 190 may be present in wall surfacesof the encapsulant 130 formed by the opening 183 passing through theencapsulant 130. Due to the presence of the void V3, the anchoringeffect may be further increased. The encapsulant 130 may include aninsulating resin 130 a and a filler 130 b, and the void V3 may be arecess formed in the encapsulant 130 by removing at least a portion ofthe filler 130 b dispersed in the encapsulating 130. The insulatingresin 130 a may be a thermosetting resin such as an epoxy resin, or athermoplastic resin such as polyimide. The filler 130 b may be aninorganic filler such as silica or alumina. A depth of one of the voidsV1 a and V1 b formed in the core 181 b may be greater than those ofother voids formed in the layers other than the core 181 b to allow theportion of the external connection terminal 190 fills deeper than otherportions thereof.

Hereinafter, the respective components included in the fan-outsemiconductor package 100A according to an example will be furtherdetailed.

The first connection member 110 may include the first and secondredistribution layers 112 a and 112 b redistributing the connection pad122 of the semiconductor chip 120, and thus, the number of theinsulating layer 141, the redistribution layer 142, and the via 143 ofthe second connection member 140 may be decreased. If necessary, thefirst connection member 110 may maintain rigidity of the fan-outsemiconductor package 100A according to materials thereof, and may serveto ensure a uniform thickness of the encapsulant 130. The firstconnection member 110 may allow the fan-out semiconductor package 100Aaccording to an example to be used as a portion of a POP structure. Thefirst connection member 110 may have the through hole 110H. Within thethrough hole 110H, the semiconductor chip 120 may be spaced apart fromthe first connection member 110 at a distance. The periphery of sidesurfaces of the semiconductor chip 120 may be enclosed by the firstconnection member 110. This is merely exemplary. The semiconductor chip120 may be modified to have other forms in various manners, and mayperform other functions, according to the other forms.

The first connection member 110 may include the insulating layer 111contacting the second connection member 140, the first redistributionlayer 112 a contacting the second connection member 140 and embedded inthe insulating layer 111, and the second redistribution layer 112 bopposing the first redistribution layer 112 a. The first connectionmember 110 may include a via 113 passing through the insulating layer111, and electrically connecting the first and second redistributionlayers 112 a and 112 b to each other. The first and secondredistribution layers 112 a and 112 b may be electrically connected tothe connection pad 122. When the first redistribution layer 112 a isembedded in the insulating layer 111, a step portion generated by athickness of the first redistribution layer 112 a may be significantlyreduced, and thus, an insulating distance of the second connectionmember 140 may become constant. For example, a difference between adistance from the redistribution layer 142 of the second connectionmember 140 to a lower surface of the insulating layer 111 and a distancefrom the redistribution layer 142 of the second connection member 140 tothe connection pad 122 may be less than the thickness of the firstredistribution layer 112 a. In this case, a high-density wiring designof the second connection member 140 may be facilitated.

A material of the insulating layer 111 is not particularly limited. Forexample, an insulating material may be used as the material of theinsulating layer 111. The insulating material may be a thermosettingresin such as an epoxy resin, a thermoplastic resin such as polyimide,and an insulating material such as a prepreg, an Ajinomoto build-up film(ABF), a FR-4 resin, or a bismaleimide triazine (BT) resin, in which thethermosetting resin and the thermoplastic resin are impregnated into acore such as an inorganic filler, glass fiber, glass cloth, or glassfabric. If necessary, the material of the insulating layer 111 may alsobe a photoimageable dielectric (PID) resin.

The first and second redistribution layers 112 a and 112 b may serve toredistribute the connection pad 122 of the semiconductor chip 120. Amaterial of the first and second redistribution layers 112 a and 112 bmay be a conductive material such as copper (Cu), aluminum (Al), silver(Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), titanium (Ti), oralloys thereof. The first and second redistribution layers 112 a and 112b may perform various functions, depending on designs thereof. Forexample, the first and second redistribution layers 112 a and 112 b mayinclude a ground (GND) pattern, a power (PWR) pattern, a signal (S)pattern, or the like. Here, the S pattern may include various signals,for example, data signals or the like, except for a GND pattern, a PWRpattern, or the like. In addition, the first and second redistributionlayers 112 a and 112 b may include a via pad, an external connectionterminal pad, or the like.

Meanwhile, at least a portion of the pad of the second redistributionlayer 112 b may be exposed by the opening 183, and a surface treatmentlayer P may be formed on the exposed at least a portion of the pad, ifnecessary. The surface treatment layer P is not particularly limited aslong as it is known in the related art, and may be formed by, forexample, electrolytic gold plating, electroless gold plating, organicsolderability preservative (OSP) or electroless tin plating, electrolesssilver plating, electroless nickel plating/substituted gold plating,direct immersion gold (DIG) plating, hot air solder leveling (HASL), orthe like. Meanwhile, the exposed at least a portion of the pad may beelectrically connected to the external connection terminal 190. Evenwhen the surface treatment layer P is formed on the exposed at least aportion of the pad, apart from the surface treatment layer P beingactually and externally exposed, it may be determined that the at leasta portion of the pad may be exposed by the opening 183 to clearlyunderstand what is exposed by the opening 183.

The via 113 may electrically connect the first and second redistributionlayers 112 a and 112 b, formed indifferent layers, to each other,resulting in formation of an electrical path in the first connectionmember 110. A material of the via 113 may be a conductive material. Thevia 113 may be fully filled with the conductive material, or theconductive material may also be formed along a wall surface of the via113. In addition, the via 113 may have all shapes known in the relatedart, such as a tapered shape, a cylindrical shape, or the like. When ahole for the via 113 is formed, a pad disposed on a portion of the firstredistribution layer 112 a may serve as a stopper, and thus, it may bebeneficial that the via 113 has a tapered shape in which a width of anupper surface thereof is greater than that of a lower surface thereof interms of a process. In this case, the via 113 may be integrated with aportion of the second redistribution layer 112 b.

The semiconductor chip 120 may be an IC provided in an amount of severalhundreds to several millions of elements or more integrated in a singlechip. The IC may be, for example, an application processor chip such asa central processor (for example, a CPU), a graphics processor (forexample, a GPU), a digital signal processor, a cryptographic processor,a microprocessor, a microcontroller, or the like, but is not limitedthereto. The semiconductor chip 120 may be formed using an active waferas a base. In this case, a base material forming the body portion 121may be silicon (Si), germanium (Ge), gallium arsenide (GaAs), or thelike. The body portion 121 may have various types of circuits formedtherein. The connection pad 122 may electrically connect thesemiconductor chip 120 to another component, and may be formed of aconductive material such as aluminum (Al) or the like without aparticular limit. The body portion 121 may have a passivation film 123formed thereon to allow the connection pad 122 to be exposed, and thepassivation film 123 may be an oxide film, a nitride film, or a duallayer of an oxide film and a nitride film. The passivation film 123 mayallow a lower surface of the connection pad 122 to be stepped with alower surface of the encapsulant 130, resulting in preventing theencapsulant 130 from bleeding to the lower surface of the connection pad122 to some extent. An insulating film (not illustrated) may further bedisposed on other required positions.

The inactive surface of the semiconductor chip 120 may be positionedbelow an upper surface of the second redistribution layer 112 b of thefirst connection member 110. For example, the inactive surface of thesemiconductor chip 120 may be positioned below an upper surface of theinsulating layer 111 of the first connection member 110. A heightdifference between the inactive surface of the semiconductor chip 120and the upper surface of the second redistribution layer 112 b of thefirst connection member 110 may be 2 μm or greater, for example, 5 μm orgreater. Here, cracks may be effectively prevented from being generatedin corners of the inactive surface of the semiconductor chip 120. Inaddition, when the encapsulant 130 is applied to the semiconductor chip120, a variation in an insulating distance from the inactive surface ofthe semiconductor chip 120 may be significantly reduced.

The encapsulant 130 may protect the first connection member 110 or thesemiconductor chip 120. An encapsulating form of the encapsulant 130 isnot particularly limited, and may be any form as long as it may surroundat least a portion of the first connection member 110 or thesemiconductor chip 120. For example, the encapsulant 130 may cover thefirst connection member 110 and the inactive surface of thesemiconductor chip 120, and may fill a space between a wall surface ofthe through hole 110H and the side surfaces of the semiconductor chip120. In addition, the encapsulant 130 may also fill at least a portionof a space between the passivation film 123 of the semiconductor chip120 and the second connection member 140. Meanwhile, the encapsulant 130may fill the through hole 110H to thus reduce buckling while serving asan adhesive, depending on materials of the encapsulant 130.

The encapsulant 130 may include an insulating material. The insulatingmaterial may be a material including an inorganic filler and aninsulating resin, for example, a thermosetting resin such as an epoxyresin, a thermoplastic resin such as polyimid, or a resin, particularly,an ABF, a FR-4 resin, a BT resin, a PID resin, or the like, in which astiffener such as an inorganic filler is included in the thermosettingresin and the thermoplastic resin. In addition, a known molding materialsuch as an epoxy molding compound (EMC) may also be used. If necessary,a material, in which a thermosetting resin or a thermoplastic resin isimpregnated into a core such as an inorganic filler, glass fiber, glasscloth, or glass fabric, may also be used.

As needed, the void V3 having the at least a portion filled with aportion of the external connection terminal 190 may be present in thewall surfaces of the encapsulant 130 formed by the opening 183 passingthrough the encapsulant 130. Due to the presence of the void V3, theanchoring effect may be further increased. The encapsulant 130 mayinclude the insulating resin 130 a and the filler 130 b, and the void V3may be a recess formed in the encapsulant 130 by removing the at least aportion of the filler 130 b dispersed in the encapsulant 130. Meanwhile,the void V3 may be formed by a method of forming a via hole, such as dryand/or wet process, or the like.

The second connection member 140 may allow the connection pad 122 of thesemiconductor chip 120 to be redistributed. Several tens to severalhundreds of connection pads 122 having various functions may beredistributed by the second connection member 140, and may be physicallyor electrically connected to an external source by connection terminals170 to be described below, depending on the functions. The secondconnection member 140 may include an insulating layer 141, aredistribution layer 142 disposed on the insulating layer 141, and a via143 passing through the insulating layer 141, and connecting theredistribution layer 142. In the fan-out semiconductor package 100Aaccording to an example, the second connection member 140 may include asingle layer, but may also include a plurality of layers. Meanwhile, thevoid V3 may be formed by a method of forming a via hole, such as dryand/or wet process, or the like.

A material of the insulating layer 141 may be an insulating material.The insulating material may be a photosensitive insulating material suchas a PID resin, in addition to the above-mentioned insulating material.For example, the insulating layer 141 may be a photosensitive insulatinglayer. In the case that the insulating layer 141 has photosensitiveproperties, the insulating layer 141 may have a further reducedthickness, and a fine pitch of the via 143 may be achieved more easily.The insulating layer 141 may be a photosensitive insulating layerincluding an insulating resin and a filler. When the insulating layer141 includes a plurality of layers, materials thereof may be the same aseach other, and may also be different from each other, if necessary.When the insulating layer 141 includes a plurality of layers, the layersmay be integrated with each other, depending on processes, so that aboundary therebetween may not be readily apparent.

The redistribution layer 142 may substantially serve to redistribute theconnection pad 122. A material of the redistribution layer 142 may be aconductive material such as copper (Cu), aluminum (Al), silver (Ag), tin(Sn), gold (Au), nickel (Ni), lead (Pb), titanium (Ti), or alloysthereof. The redistribution layer 142 may perform various functions,depending on a design thereof. For example, the redistribution layer 142may include a GND pattern, a PWR pattern, a S pattern, or the like.Here, the S pattern may include various signals, for example, datasignals, or the like, except for a GND pattern, a PWR pattern, or thelike. In addition, the redistribution layer 142 may include a via pad, aconnection terminal pad, or the like.

If necessary, a surface treatment layer (not illustrated) may be formedon a surface such as a pad pattern or the like, exposed by an opening151 formed in a passivation layer 150 to be described later, of theredistribution layer 142 of the second connection member 140. Thesurface treatment layer (not illustrated) may be formed by, for example,electrolytic gold plating, electroless gold plating, OSP or electrolesstin plating, electroless silver plating, electroless nickelplating/substituted gold plating, DIG plating, HASL, or the like.

The via 143 may electrically connect the redistribution layer 142, theconnection pad 122, or the like, formed in different layers, to eachother, resulting in formation of an electrical path in the electroniccomponent package 100A. A material of the via 143 may also be aconductive material such as copper (Cu), aluminum (Al), silver (Ag), tin(Sn), gold (Au), nickel (Ni), lead (Pb), titanium (Ti), or alloysthereof. The via 143 may be fully filled with the conductive material,or the conductive material may also be formed along the wall surface ofthe via 143. In addition, the via 143 may have all shapes known in therelated art, such as a tapered shape, a cylindrical shape, or the like.

Thicknesses of the first and second redistribution layers 112 a and 112b of the first connection member 110 may be greater than that of theredistribution layer 142 of the second connection member 140. The firstconnection member 110 may have a thickness greater than or equal to thatof the semiconductor chip 120, and thus, the first and secondredistribution layers 112 a and 112 b formed in the first connectionmember 110 may also have greater sizes to suit a scale of the firstconnection member 110. Conversely, the redistribution layer 142 of thesecond connection member 140 may be relatively smaller than the firstand second redistribution layers 112 a and 112 b of the first connectionmember 110, in order to thin the second connection member 140. In asimilar aspect, the via 113 of the first connection member 110 may havea greater dimension than that of the redistribution layer 142 of thesecond connection member 140.

The passivation layer 150 may be an additional component protecting thesecond connection member 140 from external physical or chemical damage.The passivation layer 150 may have the opening 151 exposing at least aportion of the redistribution layer 142 of the second connection member140. Such an opening may be formed in the passivation layer 150 in anamount of several tens to several thousands.

A material of the passivation layer 150 is not particularly limited, andmay be, for example, a photosensitive insulating material such as aphotosensitive insulating resin. Alternatively, the material of thepassivation layer 150 may also be a solder resist. Alternatively, thematerial of the passivation layer 150 may not include a core, but may bean insulating resin including a filler, for example, an ABF or the likeincluding an inorganic filler and an epoxy resin. When an insulatingmaterial including an inorganic filler and an insulating resin but notincluding a core, for example, an ABF or the like is used as thematerial of the passivation layer 150, the material of the passivationlayer 150 may be symmetrical to the resin layer 182, and may allowwarpage distribution to be controlled, thus being more effective forwarpage control. When an insulating material including an inorganicfiller and an insulating resin, for example, an ABF or the like, is usedas the passivation layer 150, the insulating layer 141 of the secondconnection member 140 may also include an inorganic filler and aninsulating resin. Here, a weight percentage of the inorganic fillerincluded in the passivation layer 150 may be greater than that of theinorganic filler included in the insulating layer 141 of the secondconnection member 140. In this case, a coefficient of thermal expansion(CTE) of the passivation layer 150 may be relatively low, which may beutilized for warpage control.

An under-bump metal layer 160 may be an additional component increasingconnection reliability of the connection terminals 170, and improvingboard level reliability of the fan-out semiconductor package 100A. Theunder-bump metal layer 160 may be connected to the redistribution layer142 of the second connection member 140 exposed by the opening 151 ofthe passivation layer 150. The under-bump metal layer 160 may be formedin the opening 151 of the passivation layer 150 by a known metallizationmethod using a known conductive material, for example, a metal, but isnot limited thereto.

The connection terminals 170 may be an additional component physicallyor electrically connecting the fan-out semiconductor package 100A to anexternal power source. For example, the fan-out semiconductor package100A may be mounted on the main board of the electronic device by theconnection terminals 170. The connection terminals 170 may be formed ofa conductive material, for example, a solder or the like. However, thisis merely exemplary, and a material of the connection terminals 170 isnot limited thereto. The connection terminals 170 may be a land, a ball,a pin, or the like. The connection terminals 170 may include a singlelayer or a plurality of layers. When the connection terminals 170include the layers, the connection terminals 170 may include a copper(Cu) pillar and a solder. When the connection terminals 170 include thesingle layer, the connection terminals 170 may include a tin (Sn)-silver(Ag) solder or copper. However, the connection terminals 170 are merelyexemplary, and are not limited thereto.

The number, interval, disposition, or the like, of connection terminals170 is not particularly limited, and may be sufficiently modified by aperson skilled in the art, depending on design particulars. For example,several tens to several thousands of connection terminals 170 may beprovided, according to the number of connection pads 122 of thesemiconductor chip 120, and connection terminals 170 may also beprovided in an amount not less than or not more than several tens toseveral thousands. The connection terminals 170 may cover a side surfaceof the under-bump metal layer 160 extending to one surface of thepassivation layer 150, and thus, may have further excellent connectionreliability.

At least one of the connection terminals 170 may be disposed in afan-out region. The fan-out region may denote a region except for aregion in which the semiconductor chip 120 may be disposed. For example,the fan-out semiconductor package 100A according to an example may be afan-out package. The fan-out package may have excellent reliability ascompared to a fan-in package, may allow a plurality of I/O terminals tobe implemented, and may facilitate 3D interconnectivity. In addition, ascompared to a ball grid array (BGA) package, a land grid array (LGA)package, or the like, the fan-out package may be mounted on theelectronic device without using a separate substrate. Thus, the fan-outpackage may be manufactured to have a reduced thickness, and may haveexcellent price competitiveness.

The reinforcing layer 181 may increase the rigidity of the fan-outsemiconductor package 100A. In addition, introduction of the reinforcinglayer 181 may allow the reliability of the external connection terminal190 to be increased. The reinforcing layer 181 may have a modulus ofelasticity relatively greater than that of the encapsulant 130, and mayhave a CTE relatively less than that of the encapsulant 130. In thiscase, a warpage reduction effect may be excellent. The reinforcing layer181 may include the insulating resin 181 a, the core 181 b, and thefiller 181 c. For example, the reinforcing layer 181 may be an uncladcopper clad laminate (CCL) or a prepreg. When the reinforcing layer 181includes the core 181 b such as glass fiber, glass cloth, or glassfabric, the modulus of elasticity of the reinforcing layer 181 may berelatively increased, and when the reinforcing layer 181 includes afiller, the CTE of the reinforcing layer 181 may be relatively decreasedby adjusting the content of the filler. The reinforcing layer 181 may bebonded to the encapsulant 130 in a cured state (c-stage). In this case,a boundary surface between the encapsulant 130 and the reinforcing layer181 may be substantially linear, but is not limited thereto. Ifnecessary, the reinforcing layer 181 may be bonded to the encapsulant130 in a non-cured state (b-stage), and thus, the boundary surface maybe substantially nonlinear. The filler 181 c may be an inorganic fillersuch as silica or alumina, and the insulating resin 181 a may be athermosetting resin such as an epoxy resin or a thermoplastic resin suchas polyimide.

The voids V1 a and V1 b may be present in the opening 183 passingthrough the reinforcing layer 181. In this case, the external connectionterminal 190 such as a solder ball formed in the opening 183 may fillthe at least portions of the voids V1 a and V1 b during the ref lowprocess. Portions of the external connection terminal 190, which flowinto the voids V1 a and V1 b, may form the anchoring structure, andthus, the reliability may be increased by preventing the externalconnection terminal 190 from being separated from the wall surface ofthe opening 183 even in the harsh environment in which thermal stress ormechanical stress occurs. For example, the reliability at the interfacemay be increased in a reliability test such as a TCoB test or a droptest. Meanwhile, when the material including the insulating resin 181 a,the core 181 b, and the filler 181 c may be used as the reinforcinglayer 181, the at least one of the voids V1 a and V1 b may be formed byremoving the at least a portion of the core 181 b, and additionally, theat least the other of the voids V1 a and V1 b may be formed by removingthe at least a portion of the filler 181 c. The void V1 a formed byremoving the core 181 b may have a particularly excellent anchoringeffect. In addition, in the case of having the void V1 b formed byremoving the filler 181 c, the anchoring effect may be furtherincreased. Meanwhile, the voids V1 a and V1 b may be formed by a methodof forming via holes, such as dry and/or wet process, or the like.

The resin layer 182 may be disposed on the reinforcing layer 181. Theresin layer 182 may be formed using an insulating material, for example,an ABF or the like, including the same or a similar material to theencapsulant 130, for example, the insulating resin 182 a and the filler182 b, but not including a core. When the reinforcing layer 181 includesa core or the like, it may be difficult to form the opening 183 by thereinforcing layer 181. However, when the resin layer 182 is added, theopening 183 may be easily formed. In this respect, the opening 183 maypass through the resin layer 182, and the void V2 having the at least aportion filled with a portion of the external connection terminal 190may be present in the wall surfaces of the resin layer 182 through whichthe opening 183 passes. Due to the presence of the void V2, theanchoring effect may be further increased. The resin layer 182 mayinclude the insulating resin 182 a and the filler 182 b, and the void V2may be formed by removing the at least a portion of the filler 182 b.The insulating resin 182 a may be the thermosetting resin such as theepoxy resin, or the thermoplastic resin such as the polyimide. Thefiller 182 b may be the inorganic filler such as the silica or thealumina. Meanwhile, the void V2 may be formed by a method of forming avia hole, such as dry and/or wet process, or the like.

When the fan-out semiconductor package 100A is used in a POP structureor the like, the external connection terminal 190 may be used for aninterconnection with an upper fan-out semiconductor package.Alternatively, when a separate surface mount technology (SMT) componentis attached to the fan-out semiconductor package 100A, the externalconnection terminal 190 may be used. The external connection terminal190 may be formed of a conductive material, for example, a solder or thelike. However, this is merely exemplary, and a material of the externalconnection terminal 190 is not particularly limited to the conductivematerial. The shape, number, interval, disposition, or the like of theexternal connection terminal 190 are not particularly limited. Theexternal connection terminal 190 may fill at least a portion of theopening 183, and may fill at least portions of the voids V1 a, V1 b, V2,and V3. In this case, reliability of the fan-out semiconductor package100A may be increased.

Although not illustrated in the drawings, if necessary, a metal layermay further be disposed on the wall surface of the through hole 110H.The metal layer may serve to effectively dissipate heat generated by thesemiconductor chip 120. In addition, the metal layer may serve to shieldelectromagnetic waves. Further, a separate passive component such as acapacitor or an inductor may be disposed in the through hole 110H.Moreover, a plurality of semiconductor chips 120 may be disposed in thethrough hole 110H. Also, the through hole 110H may be provided as aplurality of through holes 110H, and respective semiconductor chips 120or passive components may be disposed in the respective through holes110H. In addition, structures known in the related art may be applied.

FIG. 11 is a schematic cross-sectional view illustrating an example of afan-out semiconductor package.

Referring to the drawings, a fan-out semiconductor package 100Baccording to an example may include a first insulating layer 111 a inwhich a first connection member 110 contacts a second connection member140, a first redistribution layer 112 a contacting the second connectionmember 140 and embedded in the first insulating layer 111 a, a secondredistribution layer 112 b opposing the first redistribution layer 112 aof the first insulating layer 111 a, and a third redistribution layer112 c disposed on the first insulating layer 111 a, a second insulatinglayer 111 b disposed on the first insulating layer 111 a and coveringthe second redistribution layer 112 b, and a third redistribution layer112 c disposed on the second insulating layer 111 b. The first to thirdredistribution layers 112 a to 112 c may be electrically connected to aconnection pad 122 of a semiconductor chip 120. The first and secondredistribution layers 112 a and 112 b may be electrically connected toeach other by a first via 113 a passing through the first insulatinglayer 111 a, and the second and third redistribution layers 112 b and112 c may be electrically connected to each other by a second via 113 bpassing through the second insulating layer 111 b.

Since the first redistribution layer 112 a is embedded, an insulatingdistance of an insulating layer 141 of the second connection member 140may be substantially constant. The first connection member 110 mayinclude a large number of first to third redistribution layers 112 a to112 c, and thus, the second connection member 140 may be furthersimplified. Thus, degradation of yield due to a defect, generated in aprocess of forming the second connection member 140, may be alleviated.The first redistribution layer 112 a may be recessed inwardly of thefirst insulating layer 111 a, and thus, a lower surface of the firstinsulating layer 111 a and a lower surface of the first redistributionlayer 112 a may be stepped with each other. As a result, when anencapsulant 130 is formed, a material of the encapsulant 130 may beprevented from polluting the first redistribution layer 112 a bybleeding.

The lower surface of the first redistribution layer 112 a of the firstconnection member 110 may be positioned above a lower surface of theconnection pad 122 of the semiconductor chip 120. In addition, adistance between the redistribution layer 142 of the second connectionmember 140 and the first redistribution layer 112 a of the firstconnection member 110 may be greater than that between theredistribution layer 142 of the second connection member 140 and theconnection pad 122 of the semiconductor chip 120. This is because thefirst redistribution layer 112 a may be recessed inwardly of the firstinsulating layer 111 a. The second redistribution layer 112 b of thefirst connection member 110 may be positioned between active andinactive surfaces of the semiconductor chip 120. The first connectionmember 110 may have a thickness corresponding to that of thesemiconductor chip 120, and thus, the second redistribution layer 112 bformed inside the first connection member 110 may be disposed on a levelbetween the active and inactive surfaces of the semiconductor chip 120.

Thicknesses of the first to third redistribution layers 112 a to 112 cof the first connection member 110 may be greater than that of theredistribution layer 142 of the second connection member 140. The firstconnection member 110 may have a thickness greater than or equal to thatof the semiconductor chip 120, and thus, the first to thirdredistribution layers 112 a to 112 c may also have a greater size tosuit a scale of the first connection member 110. Conversely, theredistribution layer 142 of the second connection member 140 may have arelatively reduced size so as to be thinned.

A description of configurations other than the above-mentionedconfiguration may be substantially the same as that described above, andis thus omitted.

FIG. 12 is a schematic cross-sectional view illustrating an example of afan-out semiconductor package.

Referring to the drawings, a fan-out semiconductor package 100Caccording to an example may include a first connection member 110. Thefirst connection member 110 may include a first insulating layer 111 a,a first redistribution layer 112 a and a second redistribution layer 112b disposed on opposing surfaces of the first insulating layer 111 a, asecond insulating layer 111 b disposed on the first insulating layer 111a to cover the first redistribution layer 112 a, a third redistributionlayer 112 c disposed on the second insulating layer 111 b, a thirdinsulating layer 111 c disposed on the first insulating layer 111 a tocover the second redistribution layer 112 b, and a fourth redistributionlayer 112 d disposed on the third insulating layer 111 c. The first tofourth redistribution layers 112 a to 112 d may be electricallyconnected to a connection pad 122 of a semiconductor chip 120. The firstconnection member 110 may include a larger number of first to fourthredistribution layers 112 a to 112 d, and thus, a second connectionmember 140 may further be simplified. Thus, degradation of yield due toa defect, generated in a process of forming the second connection member140, may be alleviated. The first to fourth redistribution layers 112 ato 112 d may be electrically connected to one another by first to thirdvias 113 a to 113 c passing through the first to third insulating layers111 a to 111 c.

The first insulating layer 111 a may have a thickness greater than thoseof the second and third insulating layer 111 b and 111 c. Basically, thethickness of the first insulating layer 111 a may be relativelyincreased to maintain rigidity thereof, and the second and thirdinsulating layer 111 b and 111 c may be introduced to form largernumbers of third and fourth redistribution layers 112 c and 112 d. Thefirst insulating layer 111 a may include an insulating materialdifferent from those of the second and third insulating layers 111 b and111 c. For example, the first insulating layer 111 a may be, forexample, a prepreg including a core, an inorganic filler, and aninsulating resin, and the second and third insulating layer 111 b and111 c may be an ABF or a photosensitive insulating film including aninorganic filler and an insulating resin, but the first to thirdinsulating layers 111 a to 111 c are not limited thereto. In a similaraspect, a diameter of the first via 113 a may be greater than those ofthe second and third vias 113 b and 113 c.

A lower surface of the third redistribution layer 112 c of the firstconnection member 110 may be positioned below a lower surface of theconnection pad 122 of the semiconductor chip 120. In addition, adistance between a redistribution layer 142 of the second connectionmember 140 and the third redistribution layer 112 c of the firstconnection member 110 may be less than that between the redistributionlayer 142 of the second connection member 140 and the connection pad 122of the semiconductor chip 120. This is because the third redistributionlayer 112 c may be disposed on the second insulating layer 111 b toprotrude therefrom, resulting in contacting the second connection member140. The first and second redistribution layers 112 a and 112 b of thefirst connection member 110 may be disposed on levels between active andinactive surfaces of the semiconductor chip 120. The first connectionmember 110 may have a thickness corresponding to that of thesemiconductor chip 120, and thus, the first and second redistributionlayers 112 a and 112 b, formed inside the first connection member 110,may be disposed on the levels between the active and inactive surfacesof the semiconductor chip 120.

Thicknesses of the first to fourth redistribution layers 112 a to 112 dof the first connection member 110 may be greater than that of theredistribution layer 142 of the second connection member 140. The firstconnection member 110 may have a thickness greater than or equal to thatof the semiconductor chip 120, and thus, the first to fourthredistribution layers 112 a to 112 d may also have a size greater thanthat of the first connection member 110. Conversely, the redistributionlayer 142 of the second connection member 140 may to have a relativelyreduced size so as to be thinned.

A description of configurations other than the above-mentionedconfiguration may be substantially the same as that describing thefan-out semiconductor package 100A according to an example, and is thusomitted.

FIG. 13 is a schematic cross-sectional view illustrating an example of afan-out semiconductor package.

Referring to the drawings, a fan-out semiconductor package 100Daccording to an example may include an encapsulant 135 containing aninsulating resin 135 a, a core 135 b, and a filler 135 c, instead of thereinforcing layer 181. The encapsulant 135 may include the core 135 b tothus serve as the reinforcing layer 181. The insulating resin 135 a maybe a thermosetting resin such as an epoxy resin or a thermoplastic resinsuch as polyimide, the core 135 b may be glass fiber, glass cloth, orglass fabric, and the filler 135 c may be an inorganic filler such assilica or alumina, but the insulating resin 135 a, the core 135 b, andthe filler 135 c are not limited thereto. As an example, the encapsulant135 may be formed using a GC material that may include an insulatinglayer containing an insulating resin, a core, or a filler, a cover filmsuch as an oriented polypropylene (OPP) film covering one surface of theinsulating layer, and a base film such as a polyethylene terephthalate(PET) film covering the other surface of the insulating layer.Alternatively, the encapsulant 135 may also be formed using a GCPmaterial that may include an insulating layer containing an insulatingresin, a core, or a filler, a cover film such as an OPP film coveringone surface of the insulating layer, a primer layer such as a metallayer covering the other surface of the insulating layer, and a basefilm such as a PET film having one surface covered by the primer layer.

Meanwhile, a material of the encapsulant 135 may encapsulate a firstconnection member 110 or a semiconductor chip 120 in a non-cured state.Thus, the insulating resin 135 a and the filler 135 c may be disposed ina space between wall surfaces of a through hole 110H and side surfacesof the semiconductor chip 120, as well as on the first connection member110 and the inactive surface of the semiconductor chip 120. The core 135b may be disposed only on the first connection member 110 and theinactive surface of the semiconductor chip 120. Since the encapsulant135 includes the core 135 b, rigidity of the fan-out semiconductorpackage 100D may be retained. Since the encapsulant 135 includes thefiller 135 c, a coefficient of thermal expansion of the fan-outsemiconductor package 100D may be adjusted.

Meanwhile, the opening 183 may pass through the encapsulant 135, andsurface roughness of a wall surface of the opening 183 may be greaterthan that of an exposed surface of a pad disposed on the secondredistribution layer 112 b connected to an external connection terminal190. Thus, connecting force between the wall surface of the opening 183and the external connection terminal 190 may be increased, resulting inan improvement in reliability at an interface between the pad and theexternal connection terminal 190 in a reliability test such as a TCoBtest or a drop test.

Meanwhile, in order to relatively increase the surface roughness of thewall surface of the opening 183, voids V4 a and V4 b may be formed inthe opening 183 passing through the encapsulant 135. In this case, theexternal connection terminal 190 such as a solder bump formed in theopening 183 may fill at least portions of the voids V4 a and V4 b duringa reflow process. Portions of the external connection terminal 190,which flows into the voids V4 a and V4 b, may form an anchoringstructure, and thus, the reliability at the interface may be increasedby preventing the external connection terminal 190 from being separatedfrom the wall surface of the opening 183 even in a harsh environment inwhich thermal stress or mechanical stress occurs. Meanwhile, the voidsV4 a and V4 b may be formed by a method of forming via holes, such asdry and/or wet process, or the like.

At least one of the voids V4 a and V4 b may be a recess formed in thecore 135 b by removing at least a portion of the core 135 b, and atleast the other of the voids V4 a and V4 b may be formed in theinsulating resin 135 a by removing at least a portion of the filler 135c dispersed in the insulating resin 135 a. The void V4 a, formed byremoving the core 135 b and having a depth greater than those of anyother voids, may allow for a particularly excellent anchoring effectwhen the portion of the external connection terminal 190 fills deeperthan other portions thereof. In addition, the void V4 b, formed byremoving the filler 135 c, may allow the anchoring effect to be furtherincreased.

If necessary, a resin layer 182 may be further disposed on theencapsulant 135. The resin layer 182 may be provided to facilitateeasier formation of the opening 183. In this respect, the opening 183may pass through the resin layer 182, and a void V2 having at least aportion filled with a portion of the external connection terminal 190may be present in wall surfaces of the resin layer 182 through which theopening 183 passes. Due to the presence of the void V2, the anchoringeffect may be further increased. The resin layer 182 may include aninsulating resin 182 a and a filler 182 b, and the void V2 may be formedby removing at least a portion of the filler 182 b. The insulating resin182 a may be a thermosetting resin such as an epoxy resin, or athermoplastic resin such as polyimide. The filler 182 b may be aninorganic filler such as silica or alumina.

Meanwhile, if necessary, the above-mentioned GC or GCP material may beused as a material of a passivation layer 150. In this case, cores maybe disposed on upper and lower portions of the fan-out semiconductorpackage 100D, thus being effective to retain rigidity thereof andcontrol warpage thereof.

A description of configurations other than the above-mentionedconfiguration may be substantially the same as that describing thefan-out semiconductor package 100A according to an example, and is thusomitted.

FIG. 14 is a schematic cross-sectional view illustrating an example of afan-out semiconductor package.

Referring to the drawings, a fan-out semiconductor package 100Eaccording to an example may include a first insulating layer 111 a inwhich a first connection member 110 contacts a second connection member140, a first redistribution layer 112 a contacting the second connectionmember 140 and embedded in the first insulating layer 111 a, a secondredistribution layer 112 b opposing the first redistribution layer 112 aof the first insulating layer 111 a, a second insulating layer 111 bdisposed on the first insulating layer 111 a to cover the secondredistribution layer 112 b, and a third redistribution layer 112 cdisposed on the second insulating layer 111 b. The first to thirdredistribution layers 112 a to 112 c may be electrically connected to aconnection pad 122. The first and second redistribution layers 112 a and112 b may be electrically connected to each other by a first via 113 apassing through the first insulating layer 111 a, and the second andthird redistribution layers 112 b and 112 c may be electricallyconnected to each other by a second via 113 b passing through the secondinsulating layer 111 b.

A description of configurations other than the above-mentionedconfiguration may be substantially the same as those described in thefan-out semiconductor package 100A according to an example, the fan-outsemiconductor package 100B according to an example, and the fan-outsemiconductor package 100D according to an example, and is thus omitted.

FIG. 15 is a schematic cross-sectional view illustrating an example of afan-out semiconductor package.

Referring to the drawings, a fan-out semiconductor package 100Faccording to an example may include a first connection member 110. Thefirst connection member 110 may include a first insulating layer 111 a,a first redistribution layer 112 a and a second redistribution layer 112b disposed on opposing surfaces of the first insulating layer 111 a, asecond insulating layer 111 b disposed on the first insulating layer 111a to cover the first redistribution layer 112 a, a third redistributionlayer 112 c disposed on the second insulating layer 111 b, a thirdinsulating layer 111 c disposed on the first insulating layer 111 a tocover the second redistribution layer 112 b, and a fourth redistributionlayer 112 d disposed on the third insulating layer 111 c. The first tofourth redistribution layers 112 a to 112 d may be electricallyconnected to a connection pad 122. The first to fourth redistributionlayers 112 a to 112 d may be electrically connected to one another byfirst to third vias 113 a to 113 c passing through the first to thirdinsulating layers 111 a to 111 c.

A description of configurations other than the above-mentionedconfiguration may be substantially the same as those described in thefan-out semiconductor package 100A according to an example, the fan-outsemiconductor package 100C according to an example, and the fan-outsemiconductor package 100D according to an example, and is thus omitted.

As set forth above, according to an exemplary embodiment, a fan-outsemiconductor package, in which an external connection terminal formedin an upper portion thereof may have excellent reliability, may beprovided.

While exemplary embodiments have been shown and described above, it willbe apparent to those skilled in the art that modifications andvariations could be made without departing from the scope of the presentinvention as defined by the appended claims.

What is claimed is:
 1. A fan-out semiconductor package comprising: afirst connection member having a through hole; a semiconductor chipdisposed in the through hole, and having an active surface having aconnection pad disposed thereon and an inactive surface opposing theactive surface; an encapsulant having a first region disposed on anupper surface of the first connection member and the inactive surface ofthe semiconductor chip, and a second region extended continuously fromthe first region into the through hole, and including an insulatingresin, a filler, and core materials including one or more selected fromthe group consisting of a glass fiber, a glass cloth, and a glassfabric; a second connection member disposed on the first connectionmember and the active surface of the semiconductor chip; an openingpassing through the first region of the encapsulant; and an externalconnection terminal filling at least a portion of the opening, whereinthe first connection member and the second connection member compriseredistribution layers electrically connected to the connection pad ofthe semiconductor chip, respectively, the redistribution layer of thefirst connection member comprises a pad having at least a portionexposed by the opening to be connected to the external connectionterminal, the core materials of the encapsulant are disposed in thefirst region, the filler is dispersed in the first region and the secondregion, and the encapsulant has first voids, each of the first voids isrecessed away from a wall surface of the opening and directly exposes aportion of each of the core materials.
 2. The fan-out semiconductorpackage of claim 1, wherein each of the first voids has at least aportion filled with a portion of the external connection terminal. 3.The fan-out semiconductor package of claim 1, wherein the encapsulanthas a second void recessed away from the wall surface of the opening anddirectly exposing the insulating resin of the encapsulant.
 4. Thefan-out semiconductor package of claim 3, wherein the second void has atleast a portion filled with a portion of the external connectionterminal, each of the first voids is deeper than the second void withrespect to the wall surface of the opening.
 5. The fan-out semiconductorpackage of claim 1, further comprising: a resin layer disposed on theencapsulant, wherein the opening also passes through the resin layer,and the resin layer comprises a second void having at least a portionfilled with a portion of the external connection terminal.
 6. Thefan-out semiconductor package of claim 5, wherein the resin layercomprises an insulating resin and a filler, and the second void isrecessed away from the wall surface of the opening and directly exposingthe insulating resin of the resin layer.
 7. The fan-out semiconductorpackage of claim 6, wherein each of the first voids is deeper than thesecond void with respect to the wall surface of the opening.
 8. Thefan-out semiconductor package of claim 1, wherein the first connectionmember comprises a first insulating layer, a first redistribution layercontacting the second connection member and embedded in the firstinsulating layer, and a second redistribution layer opposing the firstredistribution layer, and the first redistribution layer and the secondredistribution layer are electrically connected to the connection pad.9. The fan-out semiconductor package of claim 8, wherein the firstconnection member further comprises a second insulating layer disposedon the first insulating layer to cover the second redistribution layer,and the pad is disposed on the second insulating layer, and the pad iselectrically connected to the connection pad.
 10. The fan-outsemiconductor package of claim 1, wherein the first connection membercomprises a first insulating layer, a first redistribution layer and asecond redistribution layer disposed on opposing surfaces of the firstinsulating layer, a second insulating layer disposed on the firstinsulating layer to cover the first redistribution layer, and a thirdredistribution layer disposed on the second insulating layer, and thefirst redistribution layer, the second redistribution layer, and thethird redistribution layer are electrically connected to the connectionpad.
 11. The fan-out semiconductor package of claim 10, wherein thefirst connection member further comprises a third insulating layerdisposed on the first insulating layer to cover the secondredistribution layer, and pad disposed on the third insulating layer,and the pad is electrically connected to the connection pad.
 12. Thefan-out semiconductor package of claim 1, wherein the wall surface ofthe opening has surface roughness greater than surface roughness of anexposed surface of the pad.
 13. The fan-out semiconductor package ofclaim 1, wherein each of the first voids is surrounded directly by atleast one of the insulating resin and the filler of the encapsulant. 14.A fan-out semiconductor package comprising: a first connection memberhaving a through hole; a semiconductor chip disposed in the throughhole, and having an active surface having a connection pad disposedthereon and an inactive surface opposing the active surface; anencapsulant encapsulating at least portions of the first connectionmember and the inactive surface of the semiconductor chip, and includingan insulating resin, a filler and a core material including one or moreselected from the group consisting of a glass fiber, a glass cloth, anda glass fabric; a second connection member disposed on the firstconnection member and the active surface of the semiconductor chip; anopening passing through the encapsulant; and an external connectionterminal filling at least a portion of the opening, wherein the firstconnection member and the second connection member compriseredistribution layers electrically connected to the connection pad ofthe semiconductor chip, respectively, the redistribution layer of thefirst connection member comprises a pad having at least a portionexposed by the opening to be connected to the external connectionterminal, and the encapsulant has first voids in a wall surface of theopening, and sidewalls of all of the first voids extending from the wallsurface of the opening are composed of the insulating resin, and endsurfaces of all of the first voids respectively connecting the sidewallsthereof are composed of the core material.
 15. The fan-out semiconductorpackage of claim 14, wherein the first voids have a portion filled witha portion of the external connection terminal.
 16. The fan-outsemiconductor package of claim 14, wherein the encapsulant has secondvoids in the wall surface of the opening, sidewalls of the second voidsextending from the wall surface of the opening are composed of theinsulating resin, and end surfaces of the second voids respectivelyconnecting the sidewalls thereof are composed of the insulating resin, amaximum depth, among depths of the second voids respectively from thewall surface of the opening to the end surfaces of the second voids, isless than a depth of each of the first voids, and the second voids havea portion filled with a portion of the external connection terminal. 17.The fan-out semiconductor package of claim 14, further comprising: aresin layer disposed on the encapsulant, wherein the opening also passesthrough the resin layer, and the resin layer comprises second voidshaving a portion filled with a portion of the external connectionterminal.
 18. The fan-out semiconductor package of claim 17, wherein theresin layer comprises an insulating resin and a filler, and sidewalls ofthe second voids extending from the wall surface of the opening arecomposed of the insulating resin of the resin layer, and end surfaces ofthe second voids connecting the sidewalls thereof are composed of theinsulating resin of the resin layer.
 19. The fan-out semiconductorpackage of claim 14, wherein the first connection member comprises afirst insulating layer, a first redistribution layer contacting thesecond connection member and embedded in the first insulating layer, anda second redistribution layer opposing the first redistribution layer,and the first redistribution layer and the second redistribution layerare electrically connected to the connection pad.
 20. The fan-outsemiconductor package of claim 14, wherein the first connection membercomprises a first insulating layer, a first redistribution layer and asecond redistribution layer disposed on opposing surfaces of the firstinsulating layer, a second insulating layer disposed on the firstinsulating layer to cover the first redistribution layer, and a thirdredistribution layer disposed on the second insulating layer, and thefirst redistribution layer, the second redistribution layer, and thethird redistribution layer are electrically connected to the connectionpad.